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EARNINGS PER SHARE (EPS) - Diluted (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allocated net income available to Common and Preferred shareholders      
Net income R$ 11,425,512 R$ 15,494,111 R$ 2,365,763
Outstanding shares      
Earnings per share - Diluted (Common and Preferred Shares) R$ 6.50 R$ 9.04 R$ 1.38
Common shares      
Allocated net income available to Common and Preferred shareholders      
Net income R$ 3,922,039 R$ 5,198,011 R$ 795,617
Adjustment to net income allocated to preferred shareholders in respect to the potential increase in number of preferred shares outstanding, as a result of long-term incentive plans of Gerdau. (20,898) (26,192) (4,782)
Net income available to owners of parent including effects of dilutive shares R$ 3,901,141 R$ 5,171,819 R$ 790,835
Outstanding shares      
Weighted-average number of shares outstanding 600,526,442 571,929,945 571,929,945
Earnings per share - Diluted (Common and Preferred Shares) R$ 6.50 R$ 9.04 R$ 1.38
Preferred shares      
Allocated net income available to Common and Preferred shareholders      
Net income R$ 7,503,473 R$ 10,296,100 R$ 1,570,146
Adjustment to net income allocated to preferred shareholders in respect to the potential increase in number of preferred shares outstanding, as a result of long-term incentive plans of Gerdau. 20,898 26,192 5,524
Net income available to owners of parent including effects of dilutive shares R$ 7,524,371 R$ 10,322,292 R$ 1,575,670
Outstanding shares      
Weighted-average number of shares outstanding 1,148,900,801 1,132,865,567 1,128,700,478
Potential increase in number of preferred shares outstanding in respect of long-term incentive plan of Gerdau 9,371,523 8,633,716 10,821,083
Total 1,158,272,324 1,141,499,283 1,139,521,561
Earnings per share - Diluted (Common and Preferred Shares) R$ 6.50 R$ 9.04 R$ 1.38